package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper  userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //当前集合用于存放从begin到end范围内的每天的营业额
        List<Double> turnoverlist = new ArrayList<>();
        for(LocalDate date:dateList){
            //査询date日期对应的营业额数据，营业额是指:状态为“已完成”的订单金额合计
            LocalDateTime  beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // select sum(amount) from orders where order time > beginTime and order time < endTime and status = 5
            Map map= new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status",5);
            Double turnover = orderMapper.sumByMap(map);
            turnoverlist.add(turnover == null ? 0.0 : turnover);
        }
        //封装到TurnoverReportVO并返回
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverlist, ","))
                .build();
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //当前集合用于存放从begin到end范围内每天新增的用户数
        List<Integer> newUserList = new ArrayList<>();
        //当前集合用于存放从begin到end范围内的每天的总用户数
        List<Integer> totalUserList = new ArrayList<>();

        for(LocalDate date:dateList){
            //查询date日期对应的用户数据
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end",endTime);
            //总用户数量
            Integer  totalUser = userMapper.countByMap(map);

            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        //封装到UserReportVO并返回
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList= new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //当前集合用于存放从begin到end范围内的每天的订单总数
        List<Integer>orderCountList = new ArrayList<>();
        //当前集合用于存放从begin到end范围内的每天的有效订单数
        List<Integer>validOrderCountList = new ArrayList<>();

        //订单总数和有效订单总数
        Integer totalOrderCount=0,totalvalidOrderCount=0;
        //遍历datelits集合，查询每日订单数据
        for(LocalDate date:dateList){
            //查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);


            totalOrderCount += orderCount;
            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            totalvalidOrderCount += validOrderCount;

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            //计算订单完成率
            orderCompletionRate = totalvalidOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(totalvalidOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end,  Integer status) {
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    /**
     * 统计指定时间区间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names  = new ArrayList<>();
        List<Integer> numbers = new ArrayList<>();
        for(GoodsSalesDTO goodsSalesDTO:salesTop10){
            names.add(goodsSalesDTO.getName());
            numbers.add(goodsSalesDTO.getNumber());
        }
        //封装到SalesTop10ReportVO并返回
        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(names, ","))
                .numberList(StringUtils.join(numbers, ","))
                .build();
    }

    /**
     *  导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dateBegin=LocalDate.now().minusDays(30);
        LocalDate dateEnd=LocalDate.now().minusDays(1);
        //查询概览数据
        BusinessDataVO businessDataVo = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            // 基于模版文件来创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 获取表格文件的sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间"+dateBegin+"至"+dateEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVo.getTurnover());
            row.getCell(4).setCellValue(businessDataVo.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVo.getNewUsers());
            // 获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVo.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVo.getUnitPrice());

            //填充明细数据
            for(int i=0; i<30; i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row=sheet.getRow( i+7);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 4. 关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }


}